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ENGINE OILING SYSTEM
9-55
/-CONNECTING
TUBE
rlNTAKE
MANIFOLD
S I X
-
C Y L I N D E R E NG I NE S
INTAKE MANIFOLD
CONNECTING TUBE
FLOW CONTROL VALVE
THIS WASHER
IS
COLOR CODED TO IDENTIFY VENT
VALVE ASSEMBLY
N B 265 B
V - 8
E N G I N E S
Fig. 130-Crankcase Ventilating System
the combustion chambers and dispelled with the ex-
haust gases (Fig. 130).
SERVICE PROCEDURES
The system must be kept clean to maintain good
engine performance durability as deposits
will
accu-
mulate in the valve, hoses, and the carburetor parts,
therefore, the ventilation system should be inspected
at least every six months and the valve replaced once
a
year preferable to coincide with the annual engine
performance evaluation. This service will be re-
quired more frequently if the vehicle is used exten-
sively for short trips-driving less than 10 miles-
with frequent idling, such as city traffic.
With the engine running at idle, remove the ven-
tilator valve and cap assembly from the rocker cover.
If the valve is not plugged, a hissing noise will usually
be heard as air passes through the valve and a strong
vacuum should be felt when a finger is placed over
the valve inlet. Replace the ventilator valve and cap
assembly and remove the inlet breather cap. With the
i -
-CONNECTING TUBE
I
INTAKE MANIFOLD
CONNECTING T
FLOW CONTROL VALVE
VALVE ASSEMBLY
S I X
-
C Y L I N D E R E N G INE S
NB265C
V - 8
E N G I N E S
Fig. 131-California
Closed Crankcase Ventilation System
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